mTORC1 依赖性和 GSDMD 介导的发育性七氟醚神经毒性中的细胞焦亡。

mTORC1-Dependent and GSDMD-Mediated Pyroptosis in Developmental Sevoflurane Neurotoxicity.

机构信息

Center for Rehabilitation Medicine, Department of Anesthesiology, Zhejiang Provincial People's Hospital (Affiliated People's Hospital, Hangzhou Medical College), Hangzhou, 310014, Zhejiang, China.

Zhejiang Chinese Medical University, Hangzhou, 310053, Zhejiang, China.

出版信息

Mol Neurobiol. 2023 Jan;60(1):116-132. doi: 10.1007/s12035-022-03070-4. Epub 2022 Oct 13.

Abstract

Developmental sevoflurane exposure leads to neuronal cell death, and subsequent learning and memory cognitive defects. The underlyi\ng mechanism remains to be elucidated. Gasdermin D (GSDMD)-mediated pyroptosis is a form of inflammatory cell death and participates in a variety of neurodegenerative diseases. Several studies illustrated that dysregulation of mTOR activity is involved in pyroptotic cell death. The current study was designed to interrogate the role of GSDMD-mediated pyroptosis and mTOR activity in developmental sevoflurane exposure. We found that inhibition of GSDMD pore formation with Disulfiram (DSF) or Necrosulfonamide (NSA) significantly attenuated sevoflurane neurotoxicity in vitro. In addition, treatment with DSF or NSA also mitigated damage-associated molecular patterns (DAMPs) release and subsequent plasma membrane rupture (PMR) induced by sevoflurane challenge. Further investigation showed that the overactivation of mTOR signaling is involved in sevoflurane induced pyroptosis both in vivo and in vitro. Intriguingly, we found that the DAMPs release and subsequent PMR triggered by developmental sevoflurane priming were compromised by knocking down the expression of mTORC1 component Raptor, but not mTORC2 component Rictor. Moreover, sevoflurane induced pyroptosis could also be restored by suppressing mTOR activity or knocking down the expressions of Ras-related small GTPases RagA or RagC. Finally, administration of DSF or NSA dramatically improved the spatial and emotional cognitive disorders without alternation of locomotor activity. Taken together, these results indicate that mTORC1-dependent and GSDMD-mediated pyroptosis contributes to the developmental sevoflurane neurotoxicity. Characterizing these processes may provide experimental evidence for the possible prevention of developmental sevoflurane neurotoxicity.

摘要

发育性七氟醚暴露导致神经元细胞死亡,并随后出现学习和记忆认知缺陷。其潜在机制仍需阐明。Gasdermin D(GSDMD)介导的细胞焦亡是一种炎症性细胞死亡形式,参与多种神经退行性疾病。几项研究表明,mTOR 活性的失调参与了细胞焦亡性死亡。本研究旨在探讨 GSDMD 介导的细胞焦亡和 mTOR 活性在发育性七氟醚暴露中的作用。我们发现,用二硫代氨基甲酸酯(DSF)或烟酰胺磺胺(NSA)抑制 GSDMD 孔形成显著减轻了体外七氟醚神经毒性。此外,DSF 或 NSA 处理也减轻了七氟醚挑战引起的损伤相关分子模式(DAMPs)释放和随后的质膜破裂(PMR)。进一步的研究表明,mTOR 信号的过度激活参与了体内和体外七氟醚诱导的细胞焦亡。有趣的是,我们发现发育性七氟醚引发的 DAMPs 释放和随后的 PMR 可通过敲低 mTORC1 成分 Raptor 的表达来削弱,但不能通过敲低 mTORC2 成分 Rictor 的表达来削弱。此外,抑制 mTOR 活性或敲低 Ras 相关小 GTPases RagA 或 RagC 的表达也可以恢复七氟醚诱导的细胞焦亡。最后,DSF 或 NSA 的给药显著改善了空间和情感认知障碍,而不改变运动活动。总之,这些结果表明,mTORC1 依赖性和 GSDMD 介导的细胞焦亡导致了发育性七氟醚神经毒性。对这些过程的描述可能为发育性七氟醚神经毒性的可能预防提供实验证据。

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